Improvement in damper-regulators for furnaces



D. G. KELLEM. Y Dampar-Regulator for; Fu'rnaces.`

No. 214,507. Patented mm2-2,1879.

N FETEHS. PMOTO-LITHOGRAPHER. WASHINGTON. D C4 'UNITED STATES PAT EEEIQEEIQL DANIEL C. KELLEM7l OF DETROIT, MICHIGAN.

IMPROVEMENT IN DAMPER-REGULATORS FORFURNACES.

Specification forming part of Letters Patent No. 214,507, dated April 22, 1879; application liled December 27, 1878.

'To all whom it may concern Beit known that I, DANIEL C. KELLEM,o Detroit, Wayne county, Michigan, have invented an Improvement in Damper-Regulators for Furnaces, of which the followingis'aspeciication.

The nature of my invention relates to certain new and useful improvements in the construction of devices for regulating the dampers of boiler-furnaces by means of the steampressure in the boilers, and is more especially designed to be an improvement upon a device for a similar purpose as patented to me May l, 1877, Patent No. l190,33

In the drawings, Figure l is an elevation, showing my device as applied to the dampervalve in a smoke-stack. Fig. 2 is a vertical central section. Fig. 3 is a sectional perspective of the hollow piston and cylinder. Fig. 4 is a cross-section on the line w w in Fig. 2. Fig. 5 is a detached perspective' view of the ring to which are attached the ears which form the fulcrum ofthe lever.

In the drawings which form a part of this specitication, A represents a hollow cylindrical piston, terminating at its lower end in a threaded pipe, B, by means of which the deviceis screwed into the dome, safety-valve, or steam-space of a steam-generator. This pipe B affords communication between the interior of the boiler and the chamber c in the bottom or lower end of the steam-cylinder piston A. Above the chamber c this piston is solid for a short distance, as shown in Fig. 2, except the small ports b, which allow the steam to pass from, the chamber a into the hollow piston proper. A valve, C, is seated in the chamber c, to cut off or admit a ow of steam through the pipe B, the stem of said valve having a vertical throw or play in a correspondinglyshaped hole drilled into the solid part of the piston between the ports b. Sleeved on said solid part of the hollow piston is a ring, D, to which are secured the ears c, in which is fulcrumed the lever E, which passes through the slot el above the end of the valve-stem. Adjustably secured upon this lever are the weights 71.. 'Io the upper end of this hollow piston there is secured the cap F, terminating in the tube G.

The cap is provided with a number of small ports or openings, i, which allow the steam to air space between the two cylinders for thev purpose of preventing a too rapid condensation of steam, as would be the case if the cylinder I were not thus inclosed. This outer cylinder has an inwardly-projecting ange at top, and rests upon the outward-projecting flange a of the cap H, and the lower end of this cylinder rests against the outwardly-projecting liange m around the'bottom of the cylinder I.

In practice, the pressure 'of steam in the boiler being required to be kept at a uniform height, the weights on the lever are so balanced that an excess of such pressure, acting upon the valve in the chamber c, will cause its stem to raise the longer arm of the lever, allowing the steam to pass into the hollow piston through the ports b, and out of the same, through the ports i, into the chamber la, exerting its pressure upon the cap H, thereby raising the cylinder I, With its outer cylinder, L, andslacking upon the chain M, which passes over the pulleys N to the crank-shaft O of the damper Pin the smoke-stack It. The greater the pressure of steam the higher within' its limit will the cylinders be forced up untilthe damper is entirely closed, thereby checking the fire in the furnace until the steam is reduced 'to the proper pressure. When this is attained the weight of the cylinders will overcome the friction between the hollow piston and the cylinder I, and fall to their original position, allowing the lever to depress the valve-stem and close the opening through the tube B, the damper opening gradually as the cylinders fall. The steam left in the cylinder I will gradually condense, and the water of condensation will pass out between the bottom of the cylinder and the piston by its own gravity. Although'described as acting'upon the damper in a smoke-flue, it may be employed with suitable connections to act lupon the door in the ash-pit of the furnace to keep the pressure of steam within the lgiven limit.

What Iclaim as my invention is- 1. In a damper-regulating` device, and in combination therewith and with a pipe communicating with a steam-generator, and provided with a valve and hollow piston, A, hav- 'iug ports b, affording communication for the device, the cap Hof the cylinder I, the guiderod K, passing through the tube-extension Gr of the cap F of the hollow piston A, as described.

4. In a damper-regulating device, the outer cylinder, L, in combination with the cylinder Iand its cap H, and with the hollow piston A, substantially as and for the purposes set forth.

5. A damper-regulating device consisting of the hollow piston A, pipe B, chamber a, in-v closing,` a valve, C, the ports b, the ring D, provided with lugs or ears c, the lever E, fulcrumed thereto, the cap F, tubular extension G, cylinder I, chamber k, ports i, guide-rod K, and incasing-cylinder L, the parts being constructed, arranged, and operating substantially as described.

DANIEL o. KELLEM.

ln presence of- Gnus. J. HUNT, H. S. SPRAGUE. 

